Effects of location and operating conditions of vortex-generator type PA on separation control around airfoil

– Second Report –

Abstract

Large-eddy simulations on a separation control flow around a NACA4418 airfoil have been conducted. In the separation control, a vortex-generator type plasma actuator (VG-PA) has been adapted with a burst actuation and a continuous actuation. Effects of the burst frequency and the burst ratio on control effects have been mainly investigated. In addition, the effect of the VG-PA length has been also investigated. The aerodynamic performances are improved with the increase of the burst ratio. The controlled flow fields by the VG-PA with the burst actuation show that they are like a hybrid flow between the flow of the intermittent SP-PA with a burst actuation and that of the VG-PA with a continuous actuation. The aerodynamic performance is improved for the longer VG-PA.